ABB PR512 Manual

Also see for PR512: Operator's manual

4DESCRIPTIONThe PR512 relays are devices using digitalmicroprocessor-based technology to obtain dataprocessing regarding the protection.The PR512 are used as switchboard protectionunits and provide protection of the installations,combined with ABB medium voltage HD4 seriescircuit-breakers.Special featuresTrip precisionWide setting rangeOperation ensured even with the primary circuitwith single-phase power supplyNo limitation of the rated breaking capacity andshort-time withstand current of the circuit-breaker even for the lowest rated currents of therelaySingle and simultaneous adjustment of the threephasesConstancy of characteristics and operatingreliabilityProcessing of the RMS value to express the trueenergy content of the current.PR512/P (50-51)provides the protection functionsagainst overload (51), instantane-ous or delayed short-circuit (50)displays the phase current with thehighest load.PR512/P (50-51-50N-51N)provides the protection functionsagainst overload (51), instantane-ous or delayed short-circuit (50),earth fault (51) and instantaneousof delayed earth fault (50N)displays the phase current with thehighest load.PR512/PD (50-51-50N-51N +dialogue)provides the protection functionsagainst overload (51), instantane-ous or delayed short-circuit (50),earth fault (51) and instantaneousof delayed earth fault (50N)displays the phase current with thehighest loadhas the dialogue function andallows connection to the electricalinstallation management system.